Correlation of residual feed intake, residual average daily gain, and residual intake and gain to carcass and steak characteristics of Hereford × Brahman steers

Objective

Our objective was to expand the understanding of Bos indicus feed efficiency by utilizing Hereford × Brahman steers to determine if residual feed intake (RFI), residual average daily gain (RADG), and residual intake and gain (RIG) influence carcass and steak characteristics.

Materials and Methods

Hereford × Brahman steers (n = 29; age ± SD = 261 ± 41 d) were transported to a facility with a GrowSafe System (GrowSafe Systems Ltd.) to determine RFI, RADG, and RIG, then to a feedyard (BW of 391 ± 39.0 kg), fed 89 d, and slaughtered (BW 731 ± 70 kg). Steers were categorized on their value compared with the mean (x) for RFI, RADG, and RIG into groups of efficient, less efficient, less inefficient, and inefficient.

Results and Discussion

Efficiency measurements RFI, RADG, and RIG were not correlated with carcass or steak characteristics. Carcasses from less inefficient RADG steers had the least internal fat. Carcasses from less efficient RIG steers had the most adjusted backfat, and less inefficient RIG steers had lower yield grades than the less efficient and inefficient RIG steers. Steaks from the less inefficient RFI steers were tougher than the efficient and less efficient RFI. All other carcass and steak characteristics were not different.

Implications and Applications

The results provide information about RFI, RADG, and RIG for Brahman- influenced herds and consideration of the small sample size should occur when applying the information to management decisions for beef herds.